571 Reputation

16 years, 354 days
Technical professional in industry or government
Budapest, Hungary

Symbolic circuit analysis algorithm for ...

Maple

Some years ago I have read about the method of Determinant Decision Diagrams. With this method one can analyze relatively large electrical circuits symbolically (for example opamp uA741 as a benchmark) . The authors wrote they had implemented the algorithm in Maple. I wonder if anybody read about this or tried to implement this algorithm. It would be nice to have this capability in Maple.

http://portal.acm.org/citation.cfm?id=266510

changing variable in integral...

Maple

Hello,

I am trying to change the variable in an integral and I have two problems with it:

My first problem is that I can't get the integrand of the new integral with GetIntegrand when I use IntegrationTools[Change] :

restart;

a1:=Int(1/(2*A),x=-A..A);

D1:=IntegrationTools[Change](a1,x=20*log[10](u));

substitution problem...

Maple

Hello,

I have an expression:

y:=a*10^(x/20)+b*10^(x/10);

(x is real here)

I 'd like to write this epxression in the form of y=a*K+b*K^(2) with Maple using 10^(x/20)=K substitution.

I have tried it with subs and algsubs but they don't work here for me.

(Originally I had a more complicated expression of this type).

numerical integration problem...

Maple

I am trying to integrate a function numerically, but Maple doesn't give an answer:

restart;

ko:=2*Pi/v*f;v:=2.998*10^8;f:=2.525*10^9;

Lo:=29.379;Wo:=34.477;

evalf(eval(1/(120*Pi^2)*Int((sin(ko*W/2*cos(theta))/cos(theta))^2*sin(theta)^3*BesselJ(0,ko*L*sin(theta)),theta=0..Pi),[L=Lo,W=Wo]));

I have Maple 12.

Incorrect result of is with abs and infi...

Maple

Hello!

I have just found this incorrect behaviour of is  (Maple 12):

restart;

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